Fullscreen playlist fails to completely leave screen after toggled

[EpicureanGit]

I really love QMPlay2 and its the best media player I've come across. I recently updated my Plasma 5 and my qt to qt5-5.9.6-x86_64-1alien for Slackware64 Current. It produces this error in full screen when toggling the playlist on the side of the screen with the mouse. I can use the handle on the side of the playlist and make a small adjustment on my 2nd monitor and move the mouse onto my first monitor and the error goes away until I toggle it again with a mouse hover.

My QMPlay2 version is QMPlay2-18.04.01-x86_64. I built it myself using SlackBuild's script and repository.

Also there is a minor issue I've come across with the binary NVIDIA drivers released since last Fall but its not a big deal. The first video played will freeze the computer for a second at the start of it on a GTX 960 and GTX 1070. I can close the application and restart it and it doesn't do it again unless I reboot. Playback top priority is set to XVideo (then OpenGL), ALSA, and CUVID decoder (then VDPAU).

[zaps166]

Could you paste me xrandr output? Do you use HiDPI mode (Device Pixel Ratio > 1.0 on one or both screens)?

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Also there is a minor issue I've come across with the binary NVIDIA drivers released since last Fall but its not a big deal.

If you use CUVID as first video decoder, it is nvidia drivers bug. CUVID uses CUDA and it loads very slow at first time. I can confirm that it didn't happen a few months ago with older drivers.

[EpicureanGit]

Thank you for the reply zaps166!

bash-4.4$ xrandr
Screen 0: minimum 8 x 8, current 7680 x 2160, maximum 32767 x 32767
DVI-D-0 connected 1920x1200+5760+480 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1920x1080 60.00
1680x1050 59.95
1600x1200 60.00
1280x1024 60.02
1280x960 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 3840x2160+1920+0 (normal left inverted right x axis y axis) 698mm x 393mm
3840x2160 60.00*+ 59.94 50.00 29.97 25.00 23.98
2560x1440 59.95
1920x1080 60.00 59.94 50.00
1680x1050 59.95
1440x900 59.89
1280x1024 60.02
1280x960 60.00
1280x800 59.81
1280x720 60.00 59.94 50.00
1024x768 60.00
800x600 60.32 56.25
720x576 50.00
720x480 59.94
640x480 59.94 59.93
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected 1920x1200+0+480 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1920x1080 60.00
1680x1050 59.95
1600x1200 60.00
1440x900 59.89
1280x1024 60.02
1280x800 59.81
1280x720 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
DP-5 disconnected (normal left inverted right x axis y axis)

I don't think I am using HiDPI mode. Plasma 5 display settings say scaling is set to 1.

bash-4.4$ xdpyinfo | grep -B 2 resolution
screen #0:
dimensions: 7680x2160 pixels (2055x578 millimeters)
resolution: 95x95 dots per inch

I hope NVIDIA fixes that bug and doesn't introduce more of them. I happened upon QMPlay2 looking for a stable video player with good performance and a good playlist setup. CUVID has worked great for my hardware.

[zaps166]

Could you try with:

export QT_AUTO_SCREEN_SCALE_FACTOR=0
export QT_SCALE_FACTOR=1
QMPlay2

Does it help?

[EpicureanGit]

I tried it and no it doesn't help.

The rectangular playlist box that contains the handles along its side remains on screen. The handle sometimes stay visible for the divider between the Information, Youtube, MediaBrowser section, and the playlist after I stop hovering the mouse over the panel. There is a point to where I move my mouse towards the QMPlay2 logo where the contents of the playlist and information tab are still visible but they disappear when the playback bar at the bottom disappears, leaving the box with handles. They comeback when the playback bar comes back after I mouse hover over the box with handles again.

[zaps166]

Thanks for explanation. I'll try to reproduce it later (1 AM here :D).

[EpicureanGit]

Here are screenshots showing what happens based on mouse position.

[zaps166]

I can't reproduce. I know that I had some issues with two screens in Qt 5.9 or 5.10 (I don't remember, maybe both). Now I have Qt 5.11.0 and no issues so far. Could you try with Qt 5.11.0?

[EpicureanGit]

Okay I'll look into doing that. I was using Qt 5.9.5 before the update to Qt 5.9.6. I suppose something changed between them that caused this bug. https://wiki.qt.io/Qt_5.9.6_Change_Files

[EpicureanGit]

Qt 5.11.0 works fine so its definitely a new feature introduced in Qt 5.9.6!

[zaps166]

Ok, so it is a Qt bug...